Copper

Quite familiar to poor folk across the world,

copper is known by spellcasters to be a magical purifier,

aiding in magic that negates sickness and poison. While its

brilliant color makes it popular for ornamental items, its

relative softness makes it unsuitable for armor or weapons

unless magically treated (which also activates its resistance).

However, it is often used in items that provide protection

from cold.

Armor made from magically treated copper grants cold

resistance 2. Items not primarily of metal are not meaningfully

affected. (A suit of chainmail is affected, while a

suit of studded leather is not.)

Magically treated copper weighs the same as steel, has

hardness 10, and has 30 hit points per inch of thickness.